I have a Toshiba 50H81. The TV shut it self off, and the light on the power button started blinking. It has done this in the past, but I unplugged it for five minutes, plugged it back in, and it worked fine after that. It happened again but when I plugged it in this time, I heard a "POP" from the back of the TV and now I have sound but no picture. I'm told by a friend that it might be a bulb, but it looks like that there are 3 bulbs in there. What do I do from here ?
Tim
If you heard a pop that would be a capacitor unable to take the voltage, hopefully no other damage, you will need to identify the capacitors that have gone and replace the parts with the same number ie 40v 300uf 105c remember don't touch the 400v or 200v capacitors as they will still have power in them, discharge them by placing a metal object over the + and the - on the capacitor and then the board will be safe.it could also be the bulb has gone. you would need to check this as if the bulb has gone the tv will shut down. and flash but usually there is an led that flashes to tell you bulb failed.
SOURCE: Toshiba 52hm84 DLP buzzing sound after replace bulb?? no pic
You have bad capacitors in the power supply that took out the regulator, or the ballast circuit is defective. Not really a repair for the novice. Good Luck
SOURCE: Sony WEGA KDF-55WF655
turn it on, takes long time to show thin color vertical lines, full of screen. please help
SOURCE: toshiba 52hmx84 shutting off
When the bulb on one of these Toshiba DLP units burns out, the unit will show a blinking green and a solid red, and restart itself 8 times, then show blinking green and red lights. A replacement bulb costs about $200 and is very easy to replace. If you replace the bulb and the symptoms continue, the problem is probably the ballast. The manual and Toshiba support will direct you to an authorized service center, but if you are ambitious and want to save the expense, here are instructions for replacing the ballast yourself.
First, many thanks to those of you who have done this before me and posted elsewhere. There was a request for pics of the ballast board install, so here it is.
FULL DISCLOSURE AND WARNING: YOU ARE ON YOUR OWN AND I WARRANT NOTHING FROM THESE PROCEDURES. I AM NOT A TV TECH. THERE ARE SOME VERY HIGH VOLTAGES IN THE BACK OF A TV BECAUSE OF THE LARGE CAPACITORS. BE CAREFUL. THERE ARE ALSO MANY DELICATE CABLES AND CONNECTORS IN THE BACK OF A DLP TV. PROCEED AT YOUR OWN RISK! IF YOU ARE UNCOMFORTABLE WITH ANY OF THE STEPS, CONTACT A TV TECHNICIAN IN YOUR AREA TO DO IT!
You will need:
1. A slightly long standard head Philips screwdriver.
2. A leatherman or small pair of pliers.
3. The Toshiba service manual. Refer to it often if you get lost. - download it here.
4. The ballast board (Toshiba Part Number: 23122468). I got mine from Conn's in Flordia here.
5. Some tape or a marker to label some of the cables so you don't forget what went where.
6. Patience. Lots of it. 
The Steps
1. UNPLUG THE TV! Put the TV somewhere so that you can easily get to the back of it. You'll need at least 3 ft of room behind the TV. REMOVE THE LAMP ASSEMBLY NOW.
2. Remove all of the screws on the lower part of the TV. Set the cover aside. It should look like this:
3. To get an idea of where we're going, as you look at the back of the TV, just behind the fan and lamp assembly is the ballast board, looks like this:
4. Next, remove the screws from the silver brace arm in the middle and the bronze screws that hold the light engine assembly. This brace is attached to the ribbon cable by a Zip tie; you do not have to cut the Zip tie if you don't want to. Refer to the service manual if the pic below doesn't show the screws clearly, but it will be obvious when you are looking at the "light engine sled".
5. Remove the bronze screw holding the plastic shield that angles down to the lamp. This screw is kind of hard to see just looking at the back of the TV, it is located up and above the ribbon cable attached to the back AV board. 
6. Using a small pair of pliers, squeeze the plastic nipples in and push the cable hangers out of the plastic shield. Remove the shield carefully from the back of the TV and set aside.
7. Slowly and very carefully, remove the copper ribbon cable as shown. This copper ribbon cable was the hardest thing to put back in during reassembly, I kid you not. I hate that ribbon cable with all of my soul. Next, remove the yellow, blue, and red connectors as shown. If you forget where they went, the connectors are different lengths and only go to one and only one receptacle. 
8. Slowly and carefully, pull out the light engine assembly. There are 2 yellow leads that power the lamp assembly that you can remove if needed. To remove them, slide the rubber footing off, and you will see a very small clip, push the clip back while pulling on the lead and it will come off. If you do take the leads off, be sure to label them with a marker or some tape. Mine were quite stubborn in letting go (I didn't see the clips under the rubber footing before this posted), so I left them on. If you do leave them on, be carefull of the stress on the cable going around the lens assembly. I removed the cables from the plastic do-hickey holding onto them and moved the yellow cables to the front of the lens assembly. 
9. Next, slowly pull out the light engine sled and turn it so that you have access to the ballast assembly, like so:
10. Noticing how filthy your ballast board probably is , remove the two screws holding the ballast board. 
11. Now, remove the 2 connectors attached to the ballast board like so:
12. Next, gently push the plastic tabs holding down the ballast board to the light engine assembly and gently push up the ballast board to loosen it from the plastic tabs grip. There are two other tabs on the other side. Now you'll now be able to remove the ballast assembly entirely to install your new board.
13. Now, on the other side of the ballast assembly is the lamp connector. Remove the screws as shown.
14. Gently turn the lamp connector towards you to remove it; notice the orientation of the connector so you install it correctly when you put the new board in. 
15. Now, install your new board and put everything back together in reverse order. This would also be a good time to take some compressed air and blow out all of the dust in there. Take your time during reassembly and be very, very, very carefull connecting everyting back together.
16. Be sure to put the back cover on, and re-install the lamp assembly before connecting your inputs and powering back on.
17. That's it! If you did everything carefully enough, you should be enjoying your Toshiba again and just saved about $350! Congrats!
SOURCE: Problem with Toshiba DLP Projection TV Model #52HM84
It is possible the lamps may be defective or that they may be the wrong replacement for this model, as it may have a different wattage setup with the ballast. If you want to try to order the TB25 lamp from a different vendor, you can order the original Toshiba replacement lamp for this model (52HM84) from a major Toshiba parts distributor at the link below:
Toshiba 52HM84 Replacement Part TB25 Lamp / Bulb
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